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<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>偶像练习生决赛镜头效果</title>
    <style>
    hr {
        border: 3px orange solid;
        width: 100px;
        transition: all 0.2s ease-in;
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    hr:hover {
        width: 500px;
    }
    </style>
</head>

<body>
    <h1>决赛镜头扩散效果</h1>
    <hr>
</body>

</html>
